ES2897883T3 - trade wheel - Google Patents

Abstract

Commercial vehicle wheel with a tread with at least two circumferential grooves (3) configured at profile depth (T), which separate central profile positives (1) and profile positives (2) on the shoulder side of each other. another, presenting the circumferential grooves (3) groove flanks (5a, 5b) that run with respect to the central profile positives (1) and the shoulder side profile positives (2) have shoulder flanks (6) that extend relative to the side wall, at least one groove flank (5a, 5b) of at least one circumferential groove (3) and/or at least one shoulder flank (6) being provided with grooves (7, 7') open towards the surface of the tread band, which enter in the axial direction in the positive or positives (1, 2) of the profile, each of the grooves (7, 7') being delimited by at least one surface (7c, 7d, 7'd), characterized by that the slits (7, 7'), determined in each c At the periphery of the tread, they have, with respect to the level of the groove flank (5a, 5b) or the shoulder flank (6), a depth (t1, t1') of 2.0 mm to 5 .0 mm and, at the level of the groove flank (5a, 5b) or the shoulder flank (6), a width (b1, b1') of 4.0 mm to 15.0 mm, the surface or surfaces being (7c, 7d 7'd), which, in each case, delimit one of the slits (7, 7'), curved in such a way that at its inner radial end(s), at a depth (T1) determined in the direction radial from 35% to 90% of the depth (T) of the profile, pass without folds to the flank (5a, 5b) of the groove or, at a depth (T1') determined in the radial direction from 35% to 150% of the depth (T) in profile without folds to the flank (6) of the shoulder.

Description

DESCRIPTION

trade wheel

The invention relates to a commercial vehicle wheel with a tread with at least two circumferential grooves made to the depth of the profile, which divide central profile positives and profile positives on the side of the shoulder from each other, presenting the circumferential grooves groove flanks running relative to the central profile positives and the shoulder-side profile positives relative to the side wall, at least one groove flank being of at least one circumferential groove and/or at least one flank of shoulder provided with grooves open towards the surface of the tread, which extend in the axial direction into the profile positive(s), each of the grooves being delimited by at least one surface.

Such a commercial vehicle wheel is known, for example, from EP 0313 361 A2. According to an exemplary embodiment, the commercial vehicle wheel has a tread, which is provided in each of the tread halves with a central circumferential groove running straight in plan view and a circumferential groove. from the side of the shoulder that runs straight in a plan view. An isolated circumferential rib is formed in each of the central circumferential grooves, which must homogenize the wear of the tread. The groove flanks of each of the circumferential grooves are provided with slits open towards the tread surface, which extend into the respective profile positive, each of the slits being configured as equal-sided trapezoids on the periphery of the tread.

From document US 2008/0066841 A1 forming the fabric, a vehicle tire with a circumferentially grooved tread with grooved flanks is known, some of the grooved flanks being provided with slits open towards the surface of the tread of rolling, which enter in the axial direction in the respective profile positive.

JP 2009 179 148 A discloses a vehicle tire with a tread with a shoulder side profile rib delimited by a circumferential groove, in which, in the region outside the surface in contact with the ground, a narrow circumferential groove runs, which gives the profile rib on the shoulder side a rib section on the outside of the tread. The rib section on the outer side of the tread is traversed by a plurality of narrow transverse notches.

It is known and customary to provide blind grooves, indentations, transverse grooves or the like in vehicle tire treads, which lead to circumferential grooves, which provide gripping edges at the periphery of the tread and thus In this way, they contribute to the improvement of grip properties on wet, sandy, gravelly, muddy or snow-covered ground. In particular, surface-shaped grooves can also be provided on the circumferential grooves, which lead into the circumferential grooves, which improve the water-discharging properties and also provide gripping edges on the tread periphery.

Especially when driving on unpaved and/or snow-covered ground, intensified stresses are introduced on the shoulder flanks, the groove flanks and the groove bottom of the circumferential grooves, thereby increasing the danger of produce cracks in the region of the incision and groove bottoms.

Therefore, the underlying object of the invention is to provide a commercial wheel of the type mentioned at the outset, which in the region of the groove bottoms of the circumferential grooves and in the region of the shoulder flanks is considerably more prone to cracking. lowers and additionally ensures good grip properties, particularly on wet, sandy, gravelly, muddy or snow-covered ground.

The proposed object is solved according to the invention in that the grooves, determined in each case at the circumference of the tread, have a depth of 2.0 in comparison with the level of the groove flank or the shoulder flank. mm to 5.0 mm and at the level of the groove flank or the shoulder flank a width of 4.0 mm to 15.0 mm, the surface or surfaces, which delimit in each case one of the grooves, being curved in such a way that at their inner radial ends they pass to a certain depth in the radial direction from 35% to 90% of the depth of the profile without folds to the flank of the groove or else they pass to a certain depth in the radial direction from 35% to 150% from profile depth without creases to shoulder groove.

All surfaces bounding a groove pass through their special bend-free curvature to the groove flank or to the shoulder flank. In contrast to conventional grooves and incisions that lead to circumferential grooves or exit from shoulder flanks, in the region of grooves according to With the invention hardly any stresses occur on the groove or shoulder flanks, so that these are very well protected against cracks. Since the surface(s), which delimit the grooves formed on the groove flanks, extend to a depth of at most 90% of the profile depth, it is guaranteed that the surface(s) emerge before a possible cross-sectional radius of the bottom of the circumferential groove. In this way, for example, compared to incisions made to profile depth, stress peaks in the groove bottom of the circumferential grooves are avoided in particular, which further increases the crack resistance in these regions. The surface or surfaces, which delimit the grooves formed on the shoulder flanks, can reach up to 150% of the profile depth. These grooves can absorb, for example, when driving on snow-covered ground, "greater" amounts of snow, whereby through the effect of "friction-snow-snow" the grip properties are improved in a certain driving situation, for example, when driving on curves. Additionally, all the grooves provide gripping edges at the periphery of the tread, whereby the wet and snow grip properties of the commercial vehicle wheel are positively influenced as a whole. Since the surface(s) extend to a depth of at least 35% of the profile depth, the mentioned gripping edges are also retained in the case of advanced tread wear. The grooves provided according to the invention thus enable good gripping properties on hard-to-drive floors or rails, the circumferential grooves and the shoulder flanks being at the same time very well protected against cracks.

According to a preferred embodiment variant, the depth of the grooves, at the periphery of the tread band with respect to the level of the groove flank or the shoulder flank, is at most 3.0 mm. Due to flat slits of this type, the susceptibility to cracks is further reduced.

Furthermore, it is preferred when the determined depth in the radial direction, at which the surface or surfaces pass without folds into the groove flank, amounts to at most 75% of the profile depth. In this way, the probability that possible high stresses leading to cracks are guided to the bottom of the groove is further reduced.

Furthermore, it is preferred when the determined depth in the radial direction, at which the surfaces pass into the shoulder flank without creases, amounts to 70% to 120% of the profile depth.

The stresses introduced when circulating on the shoulder flanks, the groove flanks and the groove bottom are further reduced when the grooves at the radial inner end have a width of 30% at the level of the groove flank or the shoulder flank. 50% of its determined width at the periphery of the tread at the level of the groove flank or the shoulder flank.

According to a preferred embodiment variant, the slits are U-shaped in plan view as a whole, the slits being delimited, for example, by a single arched or U-shaped surface in plan view. In plan view, the grooves are U-shaped as a whole, are trapezoid-shaped in plan view at the periphery of the tread and delimit the latter by edges forming sides of the trapezoid and an additional edge. In particular, additional "transverse edges" are provided at the periphery of the tread by means of the trapezoidal side ridges, which contribute to the improvement of the gripping properties. In this context, it is particularly effective when the ridges forming the trapezoidal sides, which delimit the grooves on the periphery of the tread, run with respect to the circumferential direction at an angle of 30° to 80°, in particular from 55° to 75°.

According to another preferred embodiment variant, the grooves are delimited at the periphery of the tread by two edges running V-shaped in plan view with respect to one another, which additionally represent "transverse edges". The edge-gripping effect is particularly noticeable when edges running V-shaped in plan view with respect to one another run at an angle of 40° to 70°, in particular 55°, relative to the circumferential direction. at 65°.

The commercial vehicle wheel exhibits very balanced, in particular uniformly improved, gripping properties when both groove flanks of at least one circumferential groove are provided with grooves, the grooves being formed alternately on the different groove flanks.

According to a preferred embodiment variant, the number of the slits is chosen such that the slits, which are formed on the same groove flank or shoulder flank, have a distance of 20.0 mm to 80, 0 mm with each other in the circumferential direction at the periphery of the tread.

Another preferred embodiment variant is characterized in that the distance of the grooves, which are formed on the shoulder flank itself, is chosen such that at least one, preferably one, is formed in each tread pitch. just one, slit.

Other features, advantages and details of the invention are now described in more detail by means of the drawing, which shows schematic embodiments of the invention. In this case, they show:

Fig. 1, a plan view of a circumferential section of one half of a tread of a commercial vehicle wheel with a variant embodiment of the invention,

Fig. 1 a, a section along the line Ia-Ia of Fig. 1,

Fig. 1 b, an inclined view of a detail of the tread of Fig. 1,

Fig. 2, a plan view of a circumferential section of one half of a tread of a commercial vehicle wheel with a second variant embodiment of the invention,

Fig. 2a, a section along the Na-Na line of Fig. 2,

Fig. 2b, an inclined view of a detail of the tread of Fig. 2.

Commercial vehicle wheels made according to the invention, are in particular wheels of the radial construction type for trucks, heavy vehicles and construction vehicles, which are particularly suitable for driving on unpaved roads, in particular on stony, sandy, muddy or snow covered.

In the halves of a tread shown in Fig. 1 and Fig. 2 there run, within the surface in contact with the ground, two central circumferential profile positives 1 in the circumferential direction and one profile positive 2 on the tire side. shoulder. The profile positives 1,2 are only schematic and simplified, and can have a plurality of consecutive blocks in the circumferential direction or be made in the form of circumferential profile ribs, the blocks or the profile ribs also being structured with incisions , grooves and the like. The tread half not shown in Fig. 1 and Fig. 2 is preferably made coincident with the tread half shown, a circumferential groove 4 running between the tread halves, in view in plan shown in Fig. 1 and Fig. 2, extending along the zenith of the wheel, of which only a subsection is seen in Fig. 1 and Fig. 2. Positives 1, 2 in profile they are divided from one another by circumferential grooves 3 in the example of embodiment shown in straight plan view. As shown in Fig. 1a and Fig. 2a, the circumferential grooves 3, 4 are each made to the intended profile depth T, which for a commercial vehicle wheel is normally 12.0 mm to 20.0mm.

The circumferential grooves 3 are delimited, in each case, by a groove flank 5a on the inner side of the tread band and a groove flank 5b on the outer side of the tread band, which, in the example of embodiment shown, observed in cross section, they run relative to the radial direction at an angle a of 10° to 20° (Fig. 1a, Fig. 2a). The shoulder-side profile positive 2 is delimited from the outside of the tread by a circumferential shoulder flank 6 in the circumferential direction, which runs towards the side wall, not shown.

On the groove flanks 5a, 5b of the circumferential grooves 3 and on the shoulder flank 6, a plurality of slits 7 (FIG. 1), 7' (FIG. 2) open towards the surface of tread, which extend in the axial direction into the respective profile positive 1, 2 with respect to the level of the groove flanks 5a, 5b or the shoulder flank 6.

The directly following slits 7, 7' on each of the groove flanks 5a, 5b have distances ¹ from one another in the circumferential direction of preferably 20.0 mm to 80.0 mm. The grooves 7, 7' provided in the groove flanks 5a, 5b of each of the circumferential grooves 3 are formed alternately on the different groove flanks 5a, 5b, thus in the circumferential direction to a groove 7, 7' formed on the groove flank 5a is alternately followed by a slit 7, 7' formed in the groove flank 5b. Furthermore, the grooves 7, 7' formed in the groove flank 5a, in plan view, are in each case centered between the two grooves 7, 7' formed in the groove flank 5b, directly adjacent in the circumferential direction .

The grooves 7, 7' formed on the shoulder flank 6 are distributed along the circumference of the tread, the grooves 7, 7' directly following one another in the circumferential direction having a distance a ² from one another of in particular 20.0 mm to 80.0mm. Preferably, the spacing ² is selected such that at least one, in particular just one, indentation 7, 7' is formed in the shoulder flank 6 in each of the "steps". "Pitches" are to be understood as tread profile sections provided at different circumferential lengths. In the variant shown in Fig. 1, the grooves 7 configured in the shoulder flank 6, in relative to the circumferential direction, at the same positions with respect to the grooves 7 configured on the tread inner side groove flank 5a, and in the variant shown in Fig. 2, the grooves 7' configured on the shoulder flank 6, relative to the circumferential position, are in the same positions with respect to the grooves 7' formed in the groove flank 5b on the outer side of the tread.

The configuration of a groove 7 (FIG. 1) is explained below, in particular, by a groove 7, shown in FIG. 1b, formed in the groove flank 5a on the outer side of the tread. The groove 7 is made in plan view on the U-shaped tread as a whole and on the periphery of the equal-sided trapezoidal tread (see also Fig. 1). At the periphery of the tread band, the groove 7 is delimited by edges 7a forming sides of the trapezium and an edge 7b oriented in the circumferential direction, the edges 7a forming sides of the trapezium running, in plan view, with respect to the circumferential direction under an angle p of 30° to 80°, in particular 55° to 75°. The slit 7 is further delimited by a bottom 7c connected to the edge 7b oriented in the circumferential direction and two lateral surfaces 7d connected to the edges 7a forming sides of the trapezium. The bottom 7c runs, seen in cross section, slightly arched, as well as in relation to the outwardly bulging circumferential groove 3 and passes at its radial inner end to a depth T ¹ (see also Fig. 1a), determined in the radial direction along the periphery of the tread, without creases at the flank 5a of the groove. Starting from the ridges 7a with increasing depth, the lateral surfaces 7d twist towards the groove flank 5a, so that with increasing depth the inclination of the lateral surfaces 7d relative to the circumferential direction is continuously reduced, the lateral surfaces 7d passing to the mentioned depth T ¹ also without folds at the groove flank 5a.

The depth T ¹ is from 35% to 90%, in particular at most 75%, of the profile depth T. The groove 7 has, in the circumferential direction at the level of the groove flank 5a, a width b ¹ of 10.0 mm to 15.0 mm and, moreover, at the periphery of the tread with respect to the level of the tread flank 5b. groove, a depth t ¹ of 2.0 mm to 5.0 mm, in particular at most 3.0 mm.

A possible configuration of a slit 7' (FIG. 2) is described below by the slit 7' shown in FIG. 2b. The groove 7' is delimited at the periphery of the tread by two ridges 7'a running V-shaped with respect to one another in plan view, which, in plan view, are oriented with respect to the circumferential direction under an angle p' of 40° to 70°, in particular 55° to 65°. The lateral surfaces 7'd connected to the ridges 7'a delimit the slits 7'. The lateral surfaces 7'd run together at the deepest point of the groove 7' in the ridge 7'c, which, observed in the cross section of the circumferential groove 3, is slightly arched, as well as, in relation to the circumferential groove 3, bulging outwards. Starting from the ridges 7'a with increasing depth, the lateral surfaces 7'd twist towards the groove flank 5b, so that with increasing depth the inclination of the lateral surfaces 7'd relative to the circumferential direction is continuously reduced, the lateral surfaces 7'd protruding to a depth T ¹ ' together with the edge 7'dy passing without folds to the flank 5b of the groove.

The depth T ¹ ' is from 35% to 90%, in particular at most 75%, of the profile depth T. The groove 7' has, in the circumferential direction at the level of the groove flank 5b, a width b ^{' 1} of 4.0 mm to 10.0 mm and, moreover, at the periphery of the tread band, with respect to the level of the groove flank 5b, a depth t ¹ of 2.0 mm to 5.0 mm, in particular at most 3.0 mm.

Unlike the groove 7' shown in Fig. 2b, the groove 7', as indicated in Fig. 2, can present at the level of the groove flank 5a, 5b or the shoulder flank 6, a decreasing width towards its inner radial end, the width at the inner radial end rising to the level of the flank 5a, 5b of the groove, preferably 30% to 50% of the width b' ¹ .

The invention is not limited to the described variant embodiment and is limited only within the scope of protection of the claims.

In the grooves formed on the shoulder flanks, the determined depth in the radial direction, to which the surface or surfaces delimiting the grooves pass at their radial inner end, amounts to 35% to 150%, in particular up to 70% at 120% of the profile depth. In addition, the circumferential grooves, the groove flanks of which are provided with slits, run randomly in plan view, in particular in a zigzag pattern. The tread of the commercial vehicle wheel is preferably provided with two to six circumferential grooves. The slits in the groove flanks can also be U-shaped in plan view, so that the slits are delimited by a single curved surface. Furthermore, the slits can be formed exclusively on the shoulder flanks or exclusively on the groove flanks. The width of the grooves determined at the periphery of the tread band, at the level of the groove or shoulder flank, is between 4.0 mm and 15.0 mm.

List of reference figures

1 profile positive

2 positive profile

3 circumferential groove 4 circumferential groove 5a, 5b flank of groove

6 shoulder flank

7, 7' slit

7th, 7th edge

7b edge

7c background

7'c edge

7d, 7'd lateral surface

at ¹ , at ² distance

b1, b' ¹ width

t1, t1' depth

T profile depth a, P, P' angle

Claims (14)

1. Commercial vehicle wheel with a tread having at least two circumferential grooves (3) configured at profile depth (T), which separate center profile positives (1) and shoulder side profile positives (2) one from the other, presenting the circumferential grooves (3) flanks (5a, 5b) of groove that run with respect to the positives (1) of central profile and the positives (2) of profile on the side of the shoulder present flanks (6) of shoulder running relative to the side wall, at least one groove flank (5a, 5b) of at least one circumferential groove (3) and/or at least one shoulder flank (6) being provided with grooves (7, 7 ') open towards the surface of the tread band, which enter in the axial direction in the positive or positives (1, 2) of the profile, each of the grooves (7, 7') being delimited by at least one surface ( 7c, 7d, 7'd), characterized by that the grooves (7, 7'), determined in each case on the periphery of the tread, have, with respect to the level of the groove flank (5a, 5b) or the shoulder flank (6), a depth (t ¹ , t ¹ ') from 2.0 mm to 5.0 mm and, at the level of the groove flank (5a, 5b) or the shoulder flank (6), a width (b ¹ , b ¹ ' ) from 4.0 mm to 15.0 mm, with the surface or surfaces (7c, 7d, 7'd), which, in each case, delimit one of the slits (7, 7'), curved in such a way that at its inner radial ends, at a depth (T ¹ ) determined in the radial direction from 35% to 90% of the depth (T) of the profile, pass without folds to the flank (5a, 5b) of the groove or, to a depth (T ¹ ') determined in the radial direction from 35% to 150% of the depth (T) of the profile without folds to the flank (6) of the shoulder. 2. Commercial vehicle wheel according to claim 1, characterized in that the depth (t ¹ , t ¹ ') of the grooves (7, 7') on the periphery of the tread band, with respect to the level of the flank (5a , 5b) of the groove or of the shoulder flank (6) is at most 3.0 mm. 3. Commercial vehicle wheel according to claim 1 or 2, characterized in that the depth (T ¹ ) determined in the radial direction, at which the surface(s) (7c, 7d, 7'd) pass without flank folds (5a, 5b) of groove, amounts to at most 75% of the depth (T) of the profile. 4. Commercial vehicle wheel according to claim 1 or 2, characterized in that the depth (T ¹ ') determined in the radial direction, at which the surface or surfaces (7c, 7d, 7'd) pass without folds to the shoulder flank (6), rises from 70% to 120% of the profile depth (T). Commercial vehicle wheel according to one of claims 1 to 4, characterized in that the grooves (7, 7') at the inner radial end, at the level of the flank (5a, 5b) of the groove or of the flank (6) of shoulder, have a width of 30% to 50% of its width (b ¹ , b ¹ ') determined on the periphery of the tread, at the level of the flank (5a, 5b) of groove or of the flank (6 ) shoulder. Commercial vehicle wheel according to one of claims 1 to 5, characterized in that the grooves (7), in plan view, are U-shaped as a whole. Commercial vehicle wheel according to claim 6, characterized in that the grooves (7), in plan view U-shaped as a whole, are delimited by a single arched or U-shaped surface in plan view. 8. Commercial vehicle wheel according to claim 6, characterized in that the grooves (7), in plan view U-shaped as a whole, are trapezoid-shaped in plan view at the periphery of the tread and at these are delimited by edges (7a) that form sides of the trapezium and another edge (7b). 9. Commercial vehicle wheel according to claim 8, characterized in that the edges (7a) forming sides of the trapezium, which delimit the grooves (7) on the periphery of the tread band, run with respect to the circumferential direction under an angle (p) of 30° to 80°, in particular 55° to 75°. 10. Commercial vehicle wheel according to one of claims 1 to 5, characterized in that the grooves (7') are delimited on the periphery of the tread by two edges (7'a) running in plan view in the form of V with respect to each other. 11. Commercial vehicle wheel according to claim 10, characterized in that the edges (7'a) which run in V-shaped plan view with respect to one another, run with respect to the circumferential direction at an angle (P' ) from 40° to 70°, in particular from 55° to 65°. Commercial vehicle wheel according to one of claims 1 to 11, characterized in that the two groove flanks (5a, 5b) of at least one circumferential groove (3) are provided with grooves (7, 7'), the grooves being slits (7, 7') arranged alternately on the different flanks (5a, 5b) of the groove. Commercial vehicle wheel according to one of claims 1 to 12, characterized in that the grooves (7, 7'), which are formed on the same groove flank (5a, 5b) or shoulder flank (6) , have at the periphery of the tread in the circumferential direction a distance (a ¹ , a ² ) of 20.0 mm to 80.0 mm with each other. 14. Commercial vehicle wheel according to claim 13, characterized in that the distance (a ¹ , a ² ) of the grooves (7, 7'), which are configured on the same shoulder flank (6), is chosen from such that at least one, preferably just one, groove (7, 7') is formed in each tread pitch.